Some musings as to the origin of the new material (meticulously researched by Peter Campbell, thanks!)...
"Can you fly her?" asked Ford pleasantly.
"No, can you?"
"No."
"Trillian, can you?"
"No."
"Fine," said Zaphod, relaxing. "We'll do it together."
"I can't either," said Arthur, who felt it was time he began to
assert himself.
"I'd guessed that," said Zaphod. "OK computer, I want full manual
control now."
"You got it," said the computer.
Several large desk panels slid open and banks of control consoles
sprang up out of them, showering the crew with bits of expanded
polystyrene packaging and balls of rolled-up cellophane: these
controls had never been used before.
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"Are we taking this robot with us?" said Ford, looking with
distaste at Marvin who was standing in an awkward hunched posture
in the corner under a small palm tree.
Zaphod glanced away from the mirror screens which presented a
panoramic view of the blighted landscape on which the Heart of
Gold had now landed.
"Oh, the Paranoid Android," he said. "Yeah, we'll take him."
"But what are supposed to do with a manically depressed robot?"
"You think you've got problems," said Marvin as if he was
addressing a newly occupied coffin, "what are you supposed to do
if you are a manically depressed robot? No, don't bother to
answer that, I'm fifty thousand times more intelligent than you
and even I don't know the answer. It gives me a headache just
trying to think down to your level."
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The Hitch Hiker's Guide to the Galaxy defines the marketing
ivision of the Sirius Cybernetics Corporation as "a bunch of
indless jerks who'll be the first against the wall when the
evolution comes,"
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Yep, you guessed it... The Hitchhiker's Guide to the Galaxy by Douglas Adams.